1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* fragtbl.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "internal.h"
static int grow_fragment_table(sqfs_data_writer_t *proc)
{
size_t newsz;
void *new;
if (proc->num_fragments >= proc->max_fragments) {
newsz = proc->max_fragments ? proc->max_fragments * 2 : 16;
new = realloc(proc->fragments,
sizeof(proc->fragments[0]) * newsz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
proc->max_fragments = newsz;
proc->fragments = new;
}
return 0;
}
static int grow_deduplication_list(sqfs_data_writer_t *proc)
{
size_t new_sz;
void *new;
if (proc->frag_list_num == proc->frag_list_max) {
new_sz = proc->frag_list_max * 2;
new = realloc(proc->frag_list,
sizeof(proc->frag_list[0]) * new_sz);
if (new == NULL)
return SQFS_ERROR_ALLOC;
proc->frag_list = new;
proc->frag_list_max = new_sz;
}
return 0;
}
static int store_fragment(sqfs_data_writer_t *proc, sqfs_block_t *frag,
sqfs_u64 hash)
{
int err = grow_deduplication_list(proc);
if (err)
return err;
proc->frag_list[proc->frag_list_num].index = proc->frag_block->index;
proc->frag_list[proc->frag_list_num].offset = proc->frag_block->size;
proc->frag_list[proc->frag_list_num].hash = hash;
proc->frag_list_num += 1;
sqfs_inode_set_frag_location(frag->inode, proc->frag_block->index,
proc->frag_block->size);
if (proc->hooks != NULL && proc->hooks->pre_fragment_store != NULL) {
proc->hooks->pre_fragment_store(proc->user_ptr, frag);
}
memcpy(proc->frag_block->data + proc->frag_block->size,
frag->data, frag->size);
proc->frag_block->flags |= (frag->flags & SQFS_BLK_DONT_COMPRESS);
proc->frag_block->size += frag->size;
return 0;
}
int process_completed_fragment(sqfs_data_writer_t *proc, sqfs_block_t *frag,
sqfs_block_t **blk_out)
{
sqfs_u64 hash;
size_t i, size;
int err;
hash = MK_BLK_HASH(frag->checksum, frag->size);
for (i = 0; i < proc->frag_list_num; ++i) {
if (proc->frag_list[i].hash == hash)
goto out_duplicate;
}
if (proc->frag_block != NULL) {
size = proc->frag_block->size + frag->size;
if (size > proc->max_block_size) {
*blk_out = proc->frag_block;
proc->frag_block = NULL;
}
}
if (proc->frag_block == NULL) {
size = sizeof(sqfs_block_t) + proc->max_block_size;
err = grow_fragment_table(proc);
if (err)
goto fail;
proc->frag_block = calloc(1, size);
if (proc->frag_block == NULL) {
err = SQFS_ERROR_ALLOC;
goto fail;
}
proc->frag_block->index = proc->num_fragments++;
proc->frag_block->flags = SQFS_BLK_FRAGMENT_BLOCK;
}
err = store_fragment(proc, frag, hash);
if (err)
goto fail;
return 0;
fail:
free(*blk_out);
*blk_out = NULL;
return err;
out_duplicate:
sqfs_inode_set_frag_location(frag->inode, proc->frag_list[i].index,
proc->frag_list[i].offset);
if (proc->hooks != NULL &&
proc->hooks->notify_fragment_discard != NULL) {
proc->hooks->notify_fragment_discard(proc->user_ptr, frag);
}
return 0;
}
|
